JCM GOLD GP-965 User manual
GP965 SLIP PRINTER
SERVICE MANUAL
JCM GOLD (H.K.) LTD.
JULY, 98
GP-965 service
manual
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INDEX
1. OVERVIEW
2. GENERAL PRECAUTIONS
3. REPAIR BY UNIT REPLACEMENT
Table 3-1Main Units of GP-965
Table 3-2 Required Measuring Instruments
Table 3-3 Surface Phenomena for Troubleshooting
3.1 The POWER switch is turned ON but the printer doesn’t operate
3.2 The printer operates but printing is abnormal
3.3 Paper feeding is abnormal
3.4 The control panel doesn’t work properly
4. REPAIR ON THE UNIT LEVEL
4.1 Main Circuit Board Unit
4.2 Panel SW Circuit Board Unit
4.3 Power Supply Circuit Board Unit
5. Diagram of the Power Supply Circuit
6. Diagram of Main Circuit Board
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manual
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1. OVERVIEW
Because of the variety of symptoms that may occur according to the site of the problem, troubleshooting can be quite
difficult. To simplify entry into the actual repair procedures, however, this chapter groups them into the two categories
below:
(1) Repair by unit replacement
(2) Repair of the units
First, follow the procedures for repair by unit replacement to isolate the defective element within that unit. For all
information on the troubleshooting procedures for the printer mechanism, refer to the separate “GP-965 Technical
Manual.”
2. GENERAL PRECAUTIONS
Please pay attention to the following notes for the operation of GP-965 slip printer.
Power on:
Turn on the power of ECR first, then power on GP-965 slip printer.
Power off:
Turn off the power of GP-965 slip printer first, then power off the ECR.
Operation message:
While operating the GP-965 slip printer, if GP-965 slip printer has paper, but ECR display the message that GP-965 slip
printer has no paper, please turn off the power of GP-965 slip printer, then turn on it again.
3. REPAIR BY UNIT REPLACEMENT
This section is organized on the basis of the surface phenomena that accompany the occurrence of a problem, allowing you
to distinguish between troubles on a unit basis. Table 3-1 lists the main units of this printer, and Table 3-2 lists the
instruments you will require. Table 3-3 lists each surface phenomena and the page of this chapter the corresponding
flowchart can be found.
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manual
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Table 3-1 Main Units of GP-965
Name Unit No.
Main Circuit Board Refer to the GP-965
Power Supply Board Refer to the GP-965 PS
Panel SW Circuit Board
M-290 Printer Mechanism Part Pricing List
Table 3-2 Required Measuring Instruments
Designation Standard
Tester DC voltage and resistance
Oscilloscope Equipped with 50-MHz storage
Table 3-3 Surface Phenomena for Troubleshooting
Surface Phenomena Description Page
The POWER switch is
turned ON, but the printer
doesn’t operate.
lThe POWER LED on the control
panel doesn’t light.
lThe POWER LED lights, but the
printer isn’t initialized.
5
The printer prints, but
printed results are poor.
lNo printing is performed.
lPrinting is faint.
lDots are missing.
7
Paper feeding is abnormal. lThe paper is not fed at all.
lPaper feeding is irregular and
printing is uneven.
8
The control panel doesn’t
work properly.
lThe REVERSE or RELEASE
switch doesn’t work. 9
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3.1 The POWER switch is turned ON, but the printer doesn’t operate
lCHECK POWER SUPPLY
Y
N
N
Y
N
Y
N
Y
Y
N
NY
START
Is the +24VDC
output voltage
normal?
END
Is the AC
input voltage
normal?
Check the contact of
connector and AC switch
Is the FUSE
normal?
Check the TOP224 regulator
Trouble
remedied?
END
Replace the power
supply board
Trouble remedied?
END
Replace the FUSE
Trouble
remedied?
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lCHECK MAIN CIRCUIT BOARD
Y
N
N
Y
Y
N
Y
N
N Y
START
Input +24VDC to CN1.Then
POWER LED lights?
Is the +5V voltage normal?
Check the contact of all connectors
Trouble remedied?
Replace the main circuit board
Trouble remedied?
Replace the printer mechanism
Trouble remedied?
END
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3.2 The printer operates but printing is abnormal
Y
N
N
Y
Y
N
Y
N
Y
N
START
Start the self test
Is the printing
faint or missing
dots?
Any printing is
performed?
Check the contact of connector CN5
Trouble remedied?
Replace the main circuit board
Trouble remedied?
Replace the printer mechanism
END
Wipe the print head with
alcohol
Trouble
remedied?
END
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3.3 Paper feeding is abnormal
N
Y
N
Y
Y
N
N
Y
START
Are CN5 and the M-
290 connector in
proper contact?
Replace the main circuit board
Trouble
remedied?
Replace the printer mechanism
Trouble
remedied?
END
END
Correct the contact
Trouble
remedied?
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3.4 The control panel doesn’t work properly
N
Y
N
Y
Y
N
START
Connector CN3
contact is
normal?
Replace the panel SW circuit
board
Trouble
remedied?
Replace the main board
END
Correct the contact
Trouble
remedied?
END
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