Read Sharp HT-CN400DVH (serv.man10) Technical Bulletin online
AUD 2004 01 01
Month of Issue:
20
th
June
2005
Classification:
White
TECHNICAL BULLETIN
Page 1 of 2
Sharp Electronics (UK) Limited
Reference – EAA-1255
Revision -
4
White – Carry out as required
Yellow – Carry out as required and whenever the unit comes in for service
Red – Carry out on all units
MODELS
HTCN400DVH
HTCN500DVH
SYMPTOM Unit is dead. Power supply has failed.
REASON
Failure of IC905.
ACTION
Replace IC 905, cutting off Pin 4 and carry out the modification as shown below.
1. Remove R930 and replace it with a zener diode (P6KE200). Cathode to the
cathode of D915. Anode to the cathode of D911. Refer to diagram on page 2.
2. Remove C935.
3. Add a 330pF capacitor across pins 3 and 4 of optical sensor SN1. Refer to
3. Add a 330pF capacitor across pins 3 and 4 of optical sensor SN1. Refer to
diagram on page 2.
4. Add a 5.6V zener diode to the circuit. Cathode to pin 4 of SN1. Anode to pin 3 of
IC905. Refer to diagram on page 2.
5. Change D904 from a 1N4
001
to a 1N4
148
.
6. Change C936 from a 33
µ
F 10V to a 100
µ
F 10V.
7. Change C937 from a 33
µ
F 10V to a 100
µ
F 10V.
8. Change resistor RF901.
REF NO
DESCRIPTION
PART NUMBER
PRICE CODE
R930
Zener Diode, P6KE200
92LRAD0200-001
AG
-
Capacitor, 330pF
92LPRD3545-331
AB
-
Zener Diode, 5.6V
92LRAZ0859-070
AC
D904
Diode, 1N4148
RH-
D
X0045BMZ
AA
C936
Capacitor, 100
µ
F 10V
92LPRE3951-101
AB
C937
Capacitor, 100
µ
F 10V
92LPRE3951-101
AB
IC905
NCP1050
92LRHI1050-001
AP
RF901
Resistor, 1R 0.5W
92LQA50250-109
AB
AUD 2004 01 01
Month of Issue: 28
th
January 2005
Classification:
White
TECHNICAL BULLETIN
Page 2 of 2
Sharp Electronics (UK) Limited
Reference – EAA-1255
Revision -
4
White – Carry out as required
Yellow – Carry out as required and whenever the unit comes in for service
Red – Carry out on all units
Replace
Display