Read Panasonic RR-US065E Service Manual online
11
5.3.
Unit won’t play
5.4.
Unit won’t record
-Checking the Digital System-
<1> Check the Data Transmission Between IC2 and IC4.
<1> Check the Data Transmission Between IC2 and IC4.
1. Checking the IC2 Pulse Cycle and the Clock Frequency.
*1:
• Check that when Pin No. 31 is at an L level the data changes in IC2 pins 72-76, 79-80 and 44 (data bus).
<2> Check the Data Transmission Between IC4 and IC9.
1. Checking the IC9 Pulse Cycle and the Clock Frequency.
*2:
• Check that when Pin No. 9 is at an L level the data changes in IC9 pins 41-44 and 29-32(data bus).
Categories to be
Measured
Pin No.
Mode
STHQ
STFQ
STSP
HQ
FQ
SP
Pulse
frequency *1
81 (ACKN)
2-11ms
20ms
5-15ms
18ms
20ms
20ms
Clock frequency
12 (XIN)
4.096MHz
4.096MHz
4.096MHz
4.096MHz
4.096MHz
4.096MHz
Categories to be
Measured
Pin No.
Mode
STHQ
STFQ
STSP
HQ
FQ
SP
Pulse
frequency *2
9 (/CE)
150ms
270ms
480ms
280ms
560ms
960ms
Clock frequency
18 (/WE)
1MHz
1MHz
1MHz
1MHz
1MHz
1MHz
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