Panasonic NV-SJ420EG, Service Manual

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INDICATION CAUSE REMEDY/CHECK
01 After cylinder lock is detected, the cylinder
does not start rotating again even after tape
unloading. Check the cylinder motor drive circuit.
02 Cassette tape is not wound up during the tape
unloading except EJECT mode. Check the capstan motor drive circuit.
03 Mechanism locks during mode transition
except EJECT mode.
1. Check the loading motor drive circuit.
2. Check the mechanism phase alignment.
3. Check the mode switch.
04 Mechanism locks during tape unloading.
1. Check the loading motor drive circuit.
2. Check the mechanism phase alignment.
06 Mechanism locks after tape unloading in
EJECT mode.
1. Check the loading motor drive circuit.
2. Check the mechanism phase alignment for cassette
07 During recording mode, recording signal is
less than the normal condition. Protection of the over-current flowing
transistor which produces the power
for recording mode.
08 Recording circuit works except recording
mode. Check the recording circuit.
16 Cylinder lock detection. Check the cylinder unit and the cylinder
drive circuit.
17 Supply reel mechanism lock detection Check the supply reel mechanism and
supply reel circuit.
18 Take-up reel mechanism lock detection Check the Take-up reel mechanism and
Take-up reel circuit.
2* PG shifter automatic adjustment error. Check the servo/system control circuit
cylinder unit.
Fig. T1 Self-Test indication Display
2.5. CAUTION FOR AC MAINS LEAD (NV-SJ420B)
3. ADJUSTMENT PROCEDURES
3.1. DISASSEMBLY METHOD
3.1.1. DISASSEMBLY FLOW CHART
This flow chart indicates disassembly steps of the cabinet parts and the circuit boards in order
to find the necessary items for servicing.
When reassembling, perform the steps in the reverse order.
Fig. D1
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