Read Panasonic RR-US065E Service Manual online
12
5.5.
Unit won’t play
-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)
6ms
20ms
10ms
18ms
40ms
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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