ICF-M770L, ICF-M770S, ICF-M770SL - Sony Audio Service Manual (repair manual)

Model
ICF-M770L ICF-M770S ICF-M770SL
Pages
22
Size
1.08 MB
Type
PDF
Document
Service Manual
Brand
Device
Audio
File
icf-m770l-icf-m770s-icf-m770sl.pdf
Date

View Sony ICF-M770L / ICF-M770S / ICF-M770SL Service Manual online

SERVICE MANUAL
ICF-M770L
FM/MW/LW PLL SYNTHESIZED
ICF-M770S
FM/SW/MW PLL SYNTHESIZED
ICF-M770SL
FM/SW/LW PLL SYNTHESIZED
AEP Model
ICF-M770L/M770SL
UK Model
ICF-M770L
Italian Model
East European Model
ICF-M770S
SPECIFICATIONS
ICF-M770L/M770S/M770SL
Ver 1.1  2002.06
9-873-657-02
Sony Corporation
2002F0500-1
Personal Audio Company
C
 2002.06
Published by Sony Engineering Corporation
Photo: ICF-M770SL
Time display: 24-hour system
Frequency range:
Band
ICF-M770L ICF-M770S
ICF-M770SL
Channel
step
FM
87.5 –
87.5 –
87.5 –
0.05 MHz
108 MHz
108 MHz
108 MHz
SW
5 800 –
5 800 –
5 kHz
15 900 kHz
15 900 kHz
MW
531 –
531 –
9 kHz
1 602 kHz 1 602 kHz
LW
153 –
153 –
9 kHz
279 kHz
279 kHz
Speaker: 12 cm (4
3
4
 inches), 8 Ω
Power output: 350 mW (at 10% harmonic
distortion)
Output: 
v (earphone) jack (ø 3.5 mm minijack)
Power requirements:
220–230 V AC, 50Hz
6 V DC, four R20 (size D) batteries
Dimensions:
Approx. 277 × 156 × 71.5 mm (w/h/d)
(Approx. 11 × 6
1
4
 ×
 
2
7
8
 inches) incl. projecting
parts and controls
Mass: Approx. 1 540 g (3lb 6
 
oz
 
) incl. batteries
Supplied accessories: AC power cord (1)
Design and specifications are subject to change
without notice.
2
ICF-M770L/M770S/M770SL
CF2
CF3
mark
TABLE  OF  CONTENTS
1.
SERVICING  NOTE
.................................................
2
2.
GENERAL
..................................................................
3
3.
DISASSEMBLY
3-1. Disassembly Flow ...........................................................
4
3-2. Cabinet Rear Assy ...........................................................
4
3-3. Chassis Assy ....................................................................
5
3-4. MAIN Board ...................................................................
5
4.
ELECTRICAL  ADJUSTMENTS
........................
6
5.
DIAGRAMS
5-1. Block Diagram ...............................................................
8
5-2. Note for Printed Wiring Boards and
Schematic Diagrams .......................................................
9
5-3. Printed Wiring Boards
– MAIN/JACK/POWER/INLET Boards – .................... 10
5-4. Schematic Diagram
– MAIN/JACK/POWER/INLET Boards – .................... 11
5-5. Printed Wiring Board  – KEY Board – .......................... 12
5-6. Schematic Diagram  – KEY Board – ............................ 13
5-7. IC Pin Function Description .......................................... 14
6.
EXPLODED  VIEWS
6-1. Cabinet (Front) Section ................................................... 15
6-2. Cabinet (Rear) Section .................................................... 16
6-3. Chassis Section ............................................................... 17
7.
ELECTRICAL  PARTS  LIST
.............................. 18
SAFETY-RELATED  COMPONENT  WARNING!!
COMPONENTS  IDENTIFIED  BY  MARK  
0
  OR  DOTTED
LINE  WITH  MARK  
0
  ON  THE  SCHEMATIC  DIAGRAMS
AND  IN  THE  PARTS  LIST  ARE  CRITICAL  TO  SAFE
OPERATION.  REPLACE  THESE  COMPONENTS  WITH
SONY  PARTS  WHOSE  PART  NUMBERS  APPEAR  AS
SHOWN  IN  THIS  MANUAL  OR  IN  SUPPLEMENTS  PUB-
LISHED  BY  SONY.
Notes on chip component replacement
• Never reuse a disconnected chip component.
• Notice that the minus side of a tantalum capacitor may be dam-
aged by heat.
SECTION  1
SERVICING  NOTE
Mark
Center frequency
red
10.70 MHz
blue
10.67 MHz
orange
10.73 MHz
black
10.64 MHz
white
10.76 MHz
HOW  TO  CHANGED  THE  CERAMIC  FILTERS
This model is used two ceramic filters of CF2 and CF3.
You must use same type of color marked ceramic filters in order to
meet same specifications.
Therefore, the ceramic filter must be changed two pieces together
since it’s supply two pieces in one package as a spare parts.
3
ICF-M770L/M770S/M770SL
SECTION  2
GENERAL
This section is extracted from
instruction manual.
A
Rear
Arrière
Rückseite
Parte posterior
Achterkant
R20 (size D) 
×
 4
R20 (D) 
×
 4
R20 (Größe D) 
×
 4
R20 (tamaño D) 
×
 4
R20 (D) 
×
 4
Insert 
E side of the battery first.
Insérez la borne 
E de la pile en premier.
Legen Sie die Batterien mit dem Minuspol
E zuerst ein.
Inserte primero el lado 
E de la pila.
Breng de 
E kant van de batterij eerst in.
B
To AC IN
Vers AC IN
An AC IN
A AC IN
Naar AC IN
To a wall outlet
Vers une prise murale
An eine Netzsteckdose
A la toma de pared
Naar een stopcontact
AC power cord
Cordon d’alimentation secteur
Netzkabel
Cable de alimentación de CA
Netsnoer
HOLD
OPERATION
LIGHT
mb/CLOCK TIME SET ON/OFF
SLEEP
SCAN
STANDBY
TUNE/
TIME
SET
VOL
TONE
BAND
1
2
3
4
5
6
7
PRESET TUNING
  STATION    SELECT/     PRESET
v jack
Prise 
v
Buchse 
v
Toma 
v
v aansluiting
Telescopic Antenna
Antenne télescopique
Teleskopantenne
Antena telescópica
Telescoopantenne
TUNE/TIME SET
VOL
TONE
C
FM
SW
MW/LW
CLOCK for ICF-M770L
CLOCK pour ICF-M770L
CLOCK beim ICF-M770L
CLOCK para ICF-M770L
CLOCK voor ICF-M770L
* The PRESET TUNING 4 button has a
tactile dot.
* La touche PRESET TUNING 4 a un point
tactile.
* Auf der PRESET TUNING-Taste 4
befindet sich ein fühlbarer Punkt.
* La tecla PRESET TUNING 4 tiene un
punto táctil.
* De PRESET TUNING 4 toets is voorzien
van een voelstip.
*
Setting the Clock
“0:00” will flash in the display when the batteries
are installed or the AC power cord is plugged in
for the first time.
The clock can be adjusted only when the radio is
turned off.
1
Press mb/CLOCK (CLOCK for ICF-
M770L) for more than 2 seconds.
The “hour” starts flashing.
2
Turn TUNE/TIME SET to set the hour for
the current time, then press mb/CLOCK
(CLOCK for ICF-M770L).
The “minute” starts flashing.
3
Turn TUNE/TIME SET to set the minute
for the current time, then press mb/
CLOCK
 (CLOCK for ICF-M770L).
The clock starts operating, and “:” starts flashing.
To set the current time exactly to the second, adjust
the minute and then press mb/CLOCK (CLOCK for
ICF-M770L) to synchronize with a time signal (such
as the telephone time signal).
How to Adjust the Time Digits
When you turn TUNE/TIME SET to   or  , the
time digits move forward or backward by one step,
and when you turn it to   or  , the time digits
move rapidly.
Notes
• If you do not operate mb/CLOCK (CLOCK for ICF-
M770L) or TUNE/TIME SET within 65 seconds,
the clock setting mode will be cancelled.
• 24-hour system : “0:00” = midnight, “12:00” = noon
Using the Backlight Function
Press LIGHT to turn on the backlight.
To turn off the backlight, press LIGHT again.
When operating the unit on batteries
The backlight will turn off automatically after 30
seconds to save the batteries. However, if you
operate the radio while the backlight is lit, it will
stay on for another 30 seconds.
To turn off the backlight before the time has
elapsed, press LIGHT.
ICF-M770L/M770S/M770SL
4
• This set can be disassembled in the order shown below.
3-1.
DISASSEMBLY  FLOW
SECTION  3
DISASSEMBLY
Note:
 Follow the disassembly procedure in the numerical order given.
3-2.
CABINET (REAR)  ASSY
3
telescopic antenna (ANT1)
2
screw (P3 
×
 10)
1
six screws
(BTP3 
×
 14)
6
cabinet (rear) assy
5
Remove five solders.
4
main board
main board
SET
3-2. CABINET (REAR) ASSY
(page 4)
3-4. MAIN BOARD
(page 5)
3-3. CHASSIS ASSY
(page 5)
ICF-M770L/M770S/M770SL
5
3-3.
CHASSIS  ASSY
3-4.
MAIN  BOARD
4
chassis assy
1
knob (jog)
2
knob (control) (vol)
3
knob (control) (tone)
5
main board
4
three claws
4
claw
2
claw
3
key board
1
two screws
(P2 
×
 8)
6
ICF-M770L/M770S/M770SL
no mark : common
(
) : ICF-M770L
[
] : ICF-M770S
〈〈
〉〉 : ICF-M770SL
AM IF ADJUSTMENT
Adjust for a maximum reading on level meter
T1
450 kHz
MW VT VOLTAGE ADJUSTMENT
Adjustment Part
Frequency Display
Reading on Digital Voltmeter
(L8) [L10]
531 kHz
2.5 
± 0.1 V [2.8 ± 0.1 V]
Confirmation
1,602 kHz
9.6 
± 1.0 V
MW TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
(L5-1) [L5]
603 kHz
(CT1) [CT2]
1,404 kHz
LW VT VOLTAGE ADJUSTMENT
Adjustment Part
Frequency Display
Reading on Digital Voltmeter
(CT3) 
〈〈L10〉〉
153 kHz
2.2 
± 0.1 V 〈〈2.8 ± 0.1 V〉〉
Confirmation
279 kHz
8.6 
± 1.0 V
LW TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
(L5-2) 
〈〈L5〉〉
162 kHz
CT2
243 kHz
FM VT VOLTAGE ADJUSTMENT
Adjustment Part
Frequency Display
Reading on Digital Voltmeter
L14
87.5 MHz
2.9 
± 1.0 V
Confirmation
108 MHz
9.1 
± 1.0 V
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L12, 13
87.5 MHz
CT4
108 MHz
SW VT VOLTAGE ADJUSTMENT
*
Adjustment Part
Frequency Display
Reading on Digital Voltmeter
L8
5,800 kHz
2.7 
± 0.1 V
Confirmation
15,900 kHz
9.1 
± 1.0 V
SW TRACKING ADJUSTMENT
*
Adjust for a maximum reading on level meter
L3
5,800 kHz
CT1
15,900 kHz
*: ICF-M770S/M770SL
Adjustment Location: MAIN board (See page 7)
0 dB=1 
µ
V
[MW/LW]
Setting:
BAND switch: MW or LW
[FM]
Setting:
BAND switch: FM
[SW] (ICF-M770S/M770SL)
Setting:
BAND switch: SW
• Repeat the procedures in each adjustment several times, and the
tracking adjustments should be finally done by the trimmer ca-
pacitors.
• Remove FM/SW antenna in FM/SW adjustment.
digital voltmeter
100 k
MAIN board
TP (VT)
+
AM RF signal
generator
30% amplitude
modulation by
400 Hz signal
Output level: as low as possible
+
level meter
set
32 
11 pF
MAIN board
TP (ANT)
JACK board
v
 jack (J201)
FM RF signal
generator
22.5 kHz frequency
deviation by 400 Hz
signal
Output level: as low as possible
+
level meter
set
32 
0.01 
µ
F
MAIN board
TP (ANT)
JACK board
v
 jack (J201)
AM RF signal 
generator
30% amplitude
modulation by
400 Hz signal
Output level: as low as possible
Put the lead-wire
antenna close to 
the set.
+
level meter
set
32 
JACK board
v
 jack (J201)
SECTION  4
ELECTRICAL  ADJUSTMENTS
ICF-M770L/M770S/M770SL
7
7
Adjustment Location:
– MAIN BOARD (Component Side) –
– MAIN BOARD (Conductor Side) –
TP
(VT)
TP
(ANT)
CT1
MW Tracking Adjustment (M770L)
L5-1
L13
L12
FM Tracking Adjustment
CT4
CT2
MW Tracking Adjustment (M770S)
L5
LW Tracking Adjustment (M770SL)
CT1
SW Tracking Adjustment (M770S/M770SL)
L3
T1
AM IF
Adjustment
L14
FM VT Voltage
Adjustment
CT3
LW VT Voltage
Adjustment (M770L)
L8
MW VT Voltage Adjustment (M770L)
SW VT Voltage Adjustment (M770S/M770SL)
L10
MW VT Voltage Adjustment (M770S)
LW VT Voltage Adjustment (M770SL)
CT2
LW Tracking Adjustment (M770L)
L5-2
ICF-M770L/M770S/M770SL
8
8
SECTION  5
DIAGRAMS
5-1.
BLOCK  DIAGRAM
13
10
15
18
11
6
8
FM
FRONT-END
FM
IF AMP
AF
POWER AMP
AM IF AMP,
AGC, DET
AM
FRONT-END
17
20
FM
RF IN
FM/AM
IF OUT
CF3
10.7MHz
CF2
10.7MHz
CF1
450kHz
FM
RF
FM
IF IN
TUNING METER
28
AF
OUT
AF
IN
24
25
DET
OUT
AM
IF IN
METER
NF
VOL
16
4
5
FM/AM
BAND
SELECT
AM OSC
L8
SW/MW
OSC
L10
MW/LW
OSC
L14
FM OSC
L5
MW/LW
FERRITE-ROD
ANTENNA
FM OSC
AM
RF IN
L12, 13
FM RF
FM/AM FRONT-END,
FM/AM IF AMP, DET, AGC, AF AMP
IC1
SYSTEM CONTROLLER,
LIQUID CRYSTAL DISPLAY DRIVER,
KEY CONTROL
IC104
CT2
D2-1
Q6
MW/LW
SWITCH
MW/LW
SWITCH
Q4
MW/LW
SWITCH
Q7
CT3
CT4
RV1
VOL
+
+
L14
FM VT VOLTAGE
D104, 105
(LCD BACK LIGHT)
CT3
LW VT
VOLTAGE
L10
LW VT
VOLTAGE
CT4, L12, 13
FM TRACKING
T1
AM IFT
T1
AM IF
B.P.F.
BPF1
LOW-PASS FILTER
Q104, 110
• SIGNAL PATH
: FM
: MW/LW
D1-1
D6
D7
LIGHT
16
BEEP 52
15
AM/(FM/TV)
56
EO
19
(MW/LW)/SW
4
BPF
3
MUTE
2
AC DET
TUNED
14
VCOL
20
VCOH
25
24
X101
75kHz
XIN
XOUT
17
HOLD
LCD0 – LCD12
21
COM0 – COM3
KEY MATRIX
S101 – 119
35 – 47
31 – 34
KS0 – KS4
1, 6 – 9
KR0 – KR3
10 – 13
LIQUID CRYSTAL DISPLAY
LCD101
(M770L)
CT2, L5-2
LW TRACKING
(M770L)
CT1, L5-1
MW TRACKING
(M770SL)
CT2, L5
LW TRACKING
(M770S)
CT2, L5
MW TRACKING
CT1
Q11, 12
TONE
CONTROL
SWITCH
D1-2
(M770L)
ANT1
FM/SW
ANTENNA
CF4
10.7MHz
3
FM
DISCRIMINATOR
FM
DISCRI
SP1
J201
v
MUTING
SWITCH
Q9
LED DRIVE
Q107
D9
FM/(SW/MW/LW) BAND
SELECT SWITCH
Q10
FM VCO
BUFFER
Q8
FM VCO
BUFFER
Q105
M770S/
M770SL
M770S/
M770SL
SW
SWITCH
Q1
L3
SW
RF
FM/(SW/MW/LW) BAND
SELECT SWITCH
Q5
VCC B+
D2-2
SW
SWITCH
Q4
SW BAND
SELECT SWITCH
Q3
(M770L)
M770S/
M770SL
M770S/
M770SL
S120
HOLD
OFF
+3V B+
HOLD
T202
POWER
TRANSFORMER
RECT
D205, 206
J301
AC IN -
AC DETECT
Q201
AC DETECT
Q103
DRY BATTERY
SIZE "D"
(IEC DESIGNATION R20)
4PCS. 6V
D202 – 204
5
POWER
D201
VCC B+
+3V B+
B+ SWITCH
Q109
+3V
REGULATOR
IC101
DC/DC
CONVERTER
Q106, 111, T101
LOW-PASS
FILTER
CIRCUIT
B+
D102
RV2
TONE
REG OUT
9
REG +1.2V
50
VDET1
51
CEDET
BATTERY
VOLTAGE DETECT
IC102
53
VDET2
BATTERY
VOLTAGE DETECT
IC103
B+ SWITCH
Q101
POWER ON/OFF
CONTROL SWITCH
Q102
FM/(SW/MW/LW) BAND
SELECT SWITCH
Q108
(M770L)
L5-1
MW
FERRITE-ROD
ANTENNA
L5-2
LW
FERRITE-ROD
ANTENNA
REG
+1.2V
REG
+1.2V
REG
+1.2V
Q2
SW
SWITCH
VCC B+
(M770L)
M770S/
M770SL
M770S/
M770SL
M770S/
M770SL
CT1, L3
LW TRACKING
(M770SL)
L10
MW VT
VOLTAGE
(M770S)
L8
SW VT
VOLTAGE
(M770S/M770SL)
L8
MW VT
VOLTAGE
(M770L)
ICF-M770L/M770S/M770SL
9
9
Note on Printed Wiring Board:
X
: parts extracted from the component side.
Y
: parts extracted from the conductor side.
W
: indicates side identified with part number.
f
: internal component.
: Pattern from the side which enables seeing.
(The other layers' patterns are not indicated.)
5-2.
NOTE  FOR  PRINTED  WIRING  BOARD  AND  SCHEMATIC  DIAGRAMS
Note on Schematic Diagram:
• All capacitors are in 
µ
F unless otherwise noted.  pF: 
µµ
F
50 WV or less are not indicated except for electrolytics
and tantalums.
• All resistors are in 
 and 
1
/
4
 
W or less unless otherwise
specified.
f
: internal component.
C
: panel designation.
• IC Block Diagram
IC1
CXA1019S
1
2
3
4
5
6
7
8
9
10
15
14
13
12
11
FM
DISCRIMINATOR
AF POWER AMP
AM FE
FM IF
TUNING
METER
AM IF DET AGC
FM FE
23
22
21
20
24
25
19
18 17 16
29 28 27 26
30
GND
GND
AF OUT
VCC
RIPPLE
FIL
TER
AF IN
DET OUT
AFC AGC
AFC AGC
IF GND
METER
N.C
FM IF IN
AM IF IN
FM/AM BAND
SELECT
FM/AM
IF OUT
FE GND
N.C
AM RF IN
FM RF
REG OUT
FM OSC
FM RF IN
AFC
AM OSC
VOL
NF
FM DISCRI
GND
GND
A
: B+ Line.
H
: adjustment for repair.
• Power voltage is dc 6 V and fed with regulated dc power
supply from battery terminal.
• Voltages and waveforms are dc with respect to ground in
no-signal (detuned) conditions.
no mark : FM
(
) : SW
[
] : MW
〈〈
 
〉〉
: LW
• Voltages are taken with a VOM (Input impedance 10 M
).
Voltage variations may be noted due to normal produc-
tion tolerances.
• Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal produc-
tion tolerances.
• Circled numbers refer to waveforms.
• Signal path.
F
: FM
f
: MW/LW
Note: The components identified by mark 
0
 or dotted line
with mark 
0
 are critical for safety.
Replace only with part number specified.
• Circuit Boards Location
jack board
main board
key board
inlet board
power board
ICF-M770L/M770S/M770SL
10
10
A
K/A
K
D5
K
A
K
D9
EC
B
Q12
EC
B
Q11
C55
C63
R30
C45
C57
EC
B
Q10
C38
C37
R28
R29
C34
C43
C52
C32
C58
R19
C28
C27
D7
K
A
C61
R21
C29
R18
C25
C24
D6
K
A
R17
JC7
R22
R27
JC15
R15
R20
C50
C36
C65
EC
B
Q8
Q2
BC
E
R34
C3
R3
R7
EC
B
Q5
D8
A
K
R5
C1
R10
C4
Q1
GD
S
R1
R2
C5
C6
C10
C7
JC14
JC13
C12
C20
1A
K
2A
D1
C15
R11
R13
R12
JC8
JC1
JC3
EC
B
Q4
JC11
C56
R31
C66
C64
JC10
EC
B
Q7
R25
R16
C67
C40
Q9
BC
E
R23
R24
C44
C46
C47
C30
C19
C21
C22
1A
K
2A
D2
R8
R14
C23
C11
C18
EC
B
Q3
R9
JW1
C54
+
1
5
JW2
L6
C48
+
C42 
+
C51
+
C41
+
CF1
CF4
C35
+
L14
JW5
JW4
CT4
L13
L12
BPF1
L16
L1
C8
+
C33
+
L15
JW16
L2
JW17
JW12
JW18
CT1
L7
L3
JW15
JW14
JW13
CT2
L10
RV1
JW20
JW19
JW21
L8
L9
L11
JW22
JW6
JW9
JW7
1
15
JW11
JW8
C62
+
JW3
T1
CF3
CF2
IC1
MAIN BOARD
(11)
11
1-684-571-
15
1
16
30
R33
R32
JC5
(M770L)
JC6
(M770L)
R6
EC
B
Q6
C13
C73
(M770L)
(M770L)
(M770S/M770SL)
C59
(M770L)
(M770SL)
M770S/
M770SL
M770S/
M770SL
M770S/
M770SL
VOL
RV2
TONE
JW10
JC4
JC2
C2
C17
C14
C16
(M770L)
CT3
M770S/
M770SL
M770S/
M770SL
(M770L)
A
KEY
BOARD
TP
(VT)
1
2
3
(M770S/M770SL)
TP
(ANT)
ANT1
L5
MW/LW FERRITE-ROD
ANTENNA
A
B
C
D
E
F
G
H
I
1
2
3
4
5
6
7
8
9
10
I
1
4
INLET BOARD
(11)
11
1-684-567-
D201
AK
D202
AK
D203
AK
D204
A
R202
C207
R201
R203
C206
C205
C202
Q201
1
5
C204
+
1
3
D206
D205
C203
+
1
4
J201
JACK BOARD
(11)
11
1-684-568-
T202
POWER
TRANSFORMER
POWER BOARD
(11)
11
1-684-569-
K
v
SP1
DRY BATTERY
SIZE "D"
(IEC DESIGNATION R20)
4PCS. 6V
1
3
J301
AC IN
11
12
13
14
15
L5-2
LW FERRITE-ROD
ANTENNA
L5-1
MW FERRITE-ROD
ANTENNA
(M770L)
(M770S/M770SL)
5-3.
PRINTED  WIRING  BOARDS  – MAIN/JACK/POWER/INLET Boards –
 See page 9 for Circuit Boards Location.
D1
E-3
D2
D-2
D5
C-10
D6
C-5
D7
D-5
D8
B-6
D9
C-9
D201
C-11
D202
C-11
D203
D-11
D204
D-11
D205
D-13
D206
D-13
IC1
D-7
• Semiconductor Location
Ref. No.
Location
Ref. No.
Location
Q1
B-3
Q2
C-4
Q3
C-2
Q4
F-3
Q5
B-4
Q6
D-2
Q7
E-2
Q8
D-5
Q9
G-2
Q10
B-9
Q11
D-9
Q12
C-9
Q201
D-12
(Page 12)

Download Sony ICF-M770L / ICF-M770S / ICF-M770SL Service Manual (Repair Manual)

Here you can view online and download Sony ICF-M770L / ICF-M770S / ICF-M770SL Service Manual in PDF. ICF-M770L / ICF-M770S / ICF-M770SL service manual will guide through the process and help you recover, restore, fix, disassemble and repair Sony ICF-M770L / ICF-M770S / ICF-M770SL Audio. Information contained in service manuals typically includes schematics / circuit diagrams, wiring diagrams, block diagrams, printed wiring boards, exploded views, parts list, disassembly / assembly, pcb.